The Wisconsin Department of Transportation (WisDOT) issues both single-trip and multitrip permits for OSOW vehicles .
 constructed a comprehensive database of OSOW single-trip permit records in Wisconsin and developed processing techniques, which mapped the permit routes to the highway network in Wisconsin.
From discussions with WisDOT OSOW permit issuance staff, it was ascertained that the anomalously high level of OW traffic on STH 140 stems from carriers avoiding toll plazas south of the state border in Illinois where I-39/90 is a toll road.
Traffic counts at each site included the visual identification of likely OSOW vehicles based on oversize markings and significant numbers of axles to confirm the presence of OSOW traffic at each test site (Figure 4).
Using the OW permit records and corresponding axle records from the OSOW permits database and route mapping results, queries were written to extract OW vehicle and axle frequencies (broken down by axle weight) for each test site.
For highways such as STH 140, which experience relatively low levels of truck traffic yet also receive high levels of OSOW traffic, these analyses demonstrate the importance of accurately quantifying the specific nature of the OW vehicle traffic on those roadways.
The data used to support the findings of this study can be obtained from the OSOW Unit of WisDOT.